I haven’t been able to reproduce it, but a reader sent in some great screen shots that show how the eTRS badge is being tested in search results.
You can see that there’s a good sized badge right in results in a column between the description and the price/bid column. (click to zoom)
In this close-up you get a good feel for the size of the badge (much larger than anything like the PayPal logo or the powerseller logo: (click to zoom)